词源趣谈 | as sure as eggs is eggs 确信无疑的

as sure as eggs is eggs 运用了明喻的手法，指“确信无疑的”。比如：

• One day he'll realize that I was right, sure as eggs is eggs.
  总有一天他会明白我是对的，我可以肯定这一点。

可以确定的是，这一表达与鸡蛋毫无关联。它是数学概念中“X等于X”的变体，即“某事确信无疑，如同 X 就是X”。

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